Adjustment – Front Derailleur
The front derailleur is positioned correctly when its chain guides are parallel to the chainrings and there is approximately
To adjust low gear on front derailleurs:
- Shift the chain onto the smallest front | Cable Clamp Bolt | |
Low Adjusting Screw | ||
chainring and the largest rear sprocket. | ||
High Adjusting Screw | ||
- Loosen off the control cable fixing bolt. | ||
Chainguide Clearance | ||
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- Turn the adjusting screw marked ‘L’ until | ||
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the inner cage clears the chain. |
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-With the shift lever fully in the low position, pull the control cable taut.
- | Outer Chainguide | |
Inner Chainguide | ||
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To adjust high gear on front derailleurs:
-Shift the gears until the chain moves to the smallest rear sprocket.
-Turn the adjusting screw marked ‘H’ until the chain moves to the largest chainring.
-Turn the ‘H’ adjusting screw further until the inside of the out cage of the derailleur just clears the chain.
For triple systems, altering the cable tension adjuster on the shifter levers enables the positioning to be fine tuned to a lower or higher location. Increasing tension moves the derailleur to a higher position and lessening the tension moves it to a lower position.
After making any adjustments it is important to test the gears in all possible front and rear chain positions. If the chain rubs against the cage when on the inner or outer chainring, in any rear sprocket position then turn the appropriate adjusting screw
If the chain falls off either the inner or outer chainring, turn the appropriate adjusting screw clockwise. If the chain will not shift onto either the inner or outer chairing, turn
the appropriate adjusting screw
To fine tune the front derailleur on MTB bicycles fitted with front SIS:
-Shift the chain to the largest rear sprocket and the largest front chainring.
-Shift from the largest to the middle chainring.
-Turn the cable adjusting barrel (located in the shifter), so that the inner chainguide just clears the chain.
-Test that the chain shifts cleanly, without hesitation between each chainring.
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RAOM0507 | Apollo Bicycle Company Pty. Ltd. ABN: 60 001 914 469 | Updated 23/05/07 |